Scioly.org

Ca2+

This is what's on mine:

:€

Can see the wallpaper

Wagner Parsifal Prelude

Death of the Virgin
(it's by Caravaggio)

http://img11.deviantart.net/46fe/i/2011 ... 499486.jpg

prettyyyyyyy

The scheme used by the American Public Health Association and CDC (Principles of Epi, 3rd edition) is a bit different. The 2 main categories are DIRECT and INDIRECT TRANSMISSION (not Contact). DIRECT TRANSMISSION includes DIRECT CONTACT and DROPLET SPREAD. Examples of DIRECT CONTACT includes things like kissing, biting, sex, and contact with soil containing infectious agents that penetrate the skin or enter wounds, DROPLET SPREAD is essentially an "in your face sneeze or cough". The idea is up close and immediate. INDIRECT TRANSMISSION includes AIRBORNE, VEHICLES and VECTORS. AIRBORNE transmission involves dust or droplet nuclei (the latter are essentially little (<5 micron) particles that remain suspended in the air. Time and distance are both greater than for droplet spread (distance >6-8 ft). VEHICLES include things like food, water, or fomites. Vehicles may passively carry pathogens or may promote growth or toxin production. VECTORS are arthropods (e.g. mosquitoes, flies, lice, ticks) that spread infectious agents. If the agent multiplies or undergoes a change in life stage (as with malaria) within the vector, the vector is said to be a BIOLOGIC VECTOR. If the agent is simply carried from one place to another (think of a fly landing on feces and then a bowl of potato salad) it is a MECHANICAL VECTOR. Generally vector-borne diseases are thought of only in the context of biologic vectors. Rabies from a dog bite would be direct contact. Note that while terms like food-borne, waterborne and zoonotic are not really included in this system - they are still valid.

阾

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